kactivitymanagerd probably is for your plasma activities. So some ideas;- Have you done a clean install of Linux Mint 14, or did you upgrade in place from an older version of Linux Mint? (Or convert an exisiting Ubuntu installation.) That might have result in some of your KDE configuration files causing problems now.- Which version of KDE are you using? The default, or have you upgraded to 4.10? If you haven't upgraded, you might consider doing that: viewtopic.php?f=109&t=124912#p684113. The newer version might fix whatever problem you are now having with your plasma activities.